JP6967994B2 - Lubricating oil supply device - Google Patents

Description

The present invention relates to a lubricating oil supply device that supplies lubricating oil via an oil passage in a rotating shaft.

As a device of this type, conventionally, a lubricating oil supply hole is bored inside the rotary shaft of a transmission for a vehicle in the axial direction, and the lubricating oil is supplied by penetrating the lubricating oil supply hole and the rotary shaft in the radial direction. A device is known in which lubricating oil is supplied to a plurality of axial parts around a rotating shaft through a plurality of axial supply holes communicating with the holes (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2002-310271

In such a device, in order to supply a necessary and sufficient amount of oil to each part around the rotating shaft, it is necessary to fill the entire volume of the lubricating oil supply hole in the rotating shaft with oil, and a large amount of oil is required. Is required. Therefore, the pump capacity becomes large, which leads to an increase in cost.

In one aspect of the present invention, the lubricating oil supplied from the oil pump is passed through the first hole in the axial direction formed in the rotary shaft and the first hole, and the second hole penetrates the rotary shaft in the radial direction. It is a lubricating oil supply device that supplies various parts around the rotating shaft via the above, and is accommodated in the first hole along the axial direction, and the lubricating oil supplied from the oil pump is guided and radially. A pair of axially extending pipe members having a through hole and extending radially from the outer peripheral surface of the pipe member to the peripheral surface of the first hole to form an annular space communicating with the second hole and the through hole. A plate member is provided , and the second hole and the through hole are bored at a plurality of positions in the axial direction, respectively, and the pair of plate members are provided with a plurality of axial holes corresponding to the plurality of second holes and the through holes in the axial direction. Ru provided at a location.

According to the present invention, it is possible to easily supply a necessary and sufficient amount of lubricating oil to each part around the rotating shaft without increasing the size of the oil pump.

FIG. 3 is a cross-sectional view showing an overall configuration of a vehicle drive device to which the lubricating oil supply device according to the embodiment of the present invention is applied. FIG. 1 is an enlarged view of a main part of FIG. 1 showing a main part configuration of a lubricating oil supply device according to an embodiment of the present invention. FIG. 3 is a perspective view of a pipe unit included in the lubricating oil supply device of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. The lubricating oil supply device according to the embodiment of the present invention can be applied to various devices configured to supply lubricating oil to various parts around the rotating shaft via an oil passage in the rotating shaft. In the following, an example of applying the lubricating oil supply device to the vehicle drive device will be described in particular. FIG. 1 is a cross-sectional view showing an overall configuration of a vehicle drive device to which the lubricating oil supply device according to the embodiment of the present invention is applied. In the following, for convenience, the left-right direction is defined as shown in the figure, and the configuration of each part will be described according to this definition.

As shown in FIG. 1, the vehicle drive device 100 has an electric travel motor 1 as a travel drive source. The torque output from the traveling motor 1 is transmitted to the left and right drive shafts 4 via the transmission mechanism 2 and the differential mechanism 3, whereby the vehicle travels. As described above, the vehicle includes the traveling motor 1 as a drive source, and is configured as, for example, an electric vehicle. The vehicle may be driven by an engine as a drive source, or may be driven by an engine and a traveling motor as a drive source.

The traveling motor 1 has a substantially cylindrical rotor 11 that rotates about the axis CL1 in the left-right direction, and a stator 12 that is arranged around the rotor 11, and the entire motor 1 is housed inside the case 5. The traveling motor 1 is configured as, for example, an embedded magnet synchronous motor. A synchronous reluctance motor, a switch reluctance motor, or the like having no magnet can also be used as the traveling motor 1.

The stator 12 has a substantially cylindrical stator core 13 centered on the axis CL1 arranged from the outer peripheral surface of the rotor 11 via a gap having a predetermined radial length. The stator core 13 is a stator core, and its peripheral edge is fixed to the case 5 by a through bolt 13a. A plurality of slots in the circumferential direction are provided on the inner peripheral surface of the stator core 13 toward the outer side in the radial direction, and the winding 14 (coil) is arranged in each slot by centralized winding or distributed winding. A rotating magnetic field is generated by passing a three-phase alternating current through the winding 14, and the rotor 11 rotates.

The rotor 11 has a substantially cylindrical shaft portion 15 centered on the axis CL1 and a rotor core 16 that is fitted to the outer peripheral surface of the shaft portion 15 and rotates integrally with the shaft portion 15. Inside the shaft portion 15, a substantially cylindrical rotating shaft 60 centered on the axis CL1 is inserted via a spline (spline coupling), and the shaft portion 15 and the rotating shaft 60 rotate integrally.

The left and right ends of the rotating shaft 60 project to the right and to the left of the left and right ends of the shaft 15, respectively. The rotary shaft 60 is rotatably supported from the case 5, that is, from the bearing support portions 51 and 52 provided on the case 5, via the bearings 31 and 32 on both the left and right sides of the shaft portion 15. The bearing 31 is provided on the left end portion of the rotating shaft 60, and the cotter 33 and the resolver 34 are provided side by side on the outer peripheral surface of the rotating shaft 17 between the bearing 31 and the left end surface of the shaft portion 15. The cotter 33 functions as a retaining member for parts (rotor 11 and the like) fitted to the rotating shaft 60. The resolver 34 detects the rotation speed of the rotor 11.

The bearing 32 is arranged in contact with the right end surface of the shaft portion 15 of the rotor 11. A gear 61 is provided on the outer peripheral surface of the rotating shaft 60 over the entire circumference on the right side of the bearing 32. Further, a parking gear 35 is fitted (spline-coupled) on the outer peripheral surface of the rotating shaft 60 via a spline on the right side of the gear 61, and the rotating shaft 60 and the parking gear 35 rotate integrally.

The parking gear 35 is provided with a claw portion of a parking pole (not shown) swingably supported by the case 5 so as to be engaged with the parking gear 35. When the parking pole is swung by the drive of the parking actuator and the claw portion of the parking pole engages with the parking gear 35, the parking device is activated, and when the claw portion is disengaged, the operation of the parking device is released. NS. A nut 36 is fastened to the right end of the rotating shaft 60 adjacent to the parking gear 35.

A rotating body 20 constituting the speed change mechanism 2 is arranged on the right side of the traveling motor 1. The left and right ends of the shaft portion 21 of the rotating body 20 can rotate from the case 5 via the bearings 22 and 23 around the axis CL2 in the left-right direction, that is, from the bearing support portions 53 and 54 provided in the case 5. Be supported. The shaft portion 21 is provided with a large-diameter gear 24 and a small-diameter gear 25, and the large-diameter gear 24 is meshed with a gear 61 on the outer peripheral surface of the rotating shaft 60.

The small diameter gear 25 is meshed with the ring gear 3a of the differential mechanism 3. As a result, the torque of the traveling motor 1 is input to the left and right drive shafts 4 via the rotary shaft 60, the gear 61, the large diameter gear 24, the small diameter gear 25, the ring gear 3a, and the differential mechanism 3. As a result, the left and right drive wheels (not shown) are driven, and the vehicle runs.

Lubricating oil discharged from the oil pump 6 is supplied to each part of the vehicle drive device 100 configured in this way via an oil passage. The oil passages include a first oil passage PA1 extending along the right side wall of the case 5, a second oil passage PA2 extending in the left-right direction along the axis CL1 and passing through the rotation shaft 60, and a case. Includes a third oil passage PA3 extending along the left wall of 5. An oil pump 6 is connected to the first oil passage PA1, and the lubricating oil of the first oil passage PA1 flows to the third oil passage PA3 via the second oil passage PA2. The lubricating oil that passes through the rotating shaft 60 (second oil passage PA2) is supplied to parts such as the rotor 11 arranged around the rotating shaft 60 through a hole that penetrates the rotating shaft 60 in the radial direction. ..

By the way, there is a possibility that the lubricating oil in the rotating shaft 60 may be biased due to the inclination of the vehicle or the action of acceleration in the front-rear direction or the left-right direction on the vehicle, and as a result, sufficient parts around the rotating shaft 60 are sufficiently used. It may be difficult to supply a large amount of lubricating oil. In order to avoid this, it is necessary to fill the hole in the rotating shaft 60 along the axis CL1 with lubricating oil, but for that purpose, it is necessary to increase the pump capacity, and the oil pump 6 becomes large. This leads to an increase in cost. Therefore, in the present embodiment, in order to be able to supply the necessary and sufficient lubricating oil to each part around the rotating shaft 60 without increasing the size of the oil pump 6, the lubricating oil supply device is configured as follows.

FIG. 2 is a diagram (enlarged view of the main part of FIG. 1) showing a main part configuration of the lubricating oil supply device according to the present embodiment. As shown in FIG. 2, a through hole 62 having a substantially cylindrical surface shape is opened in the central portion of the rotating shaft 60 from the left end surface to the right end surface along the axis CL1. A plurality of radial through holes 63 are opened in the rotating shaft 60 at predetermined positions in the axial direction. The through holes 63 are provided at, for example, four axial directions (positions A to D) corresponding to the lubricating oil supply points. The through holes 63 at positions A to D are represented by 63A to 63D, respectively.

The through hole 63A is located inside the resolver 34 in the radial direction. The lubricating oil that has flowed out of the rotating shaft 60 through the through hole 63A flows along the rotor 11, whereby the rotor 11 can be cooled. That is, the through hole 63A at the position A mainly constitutes an oil passage for cooling the rotor.

The through hole 63B is located inside the shaft portion 15 of the rotor 11 in the radial direction. The lubricating oil that has flowed out of the rotating shaft 60 through the through hole 63B flows along the gap between the outer peripheral surface of the rotating shaft 60 and the inner peripheral surface of the shaft portion 15, and then flows along the gap between the shaft portion 15 and the rotor core 16. Flows along the mating surface between and lubricates the rotor 11. That is, the through hole 63B at the position B mainly constitutes an oil passage for lubricating the rotor.

The through hole 63C is located radially inside the boundary portion between the shaft portion 15 and the bearing 32. The lubricating oil that has flowed out of the rotating shaft 60 through the through hole 63C is supplied to the bearing 32 and lubricates the bearing 32. That is, the through hole 63C at the position C mainly constitutes an oil passage for bearing lubrication.

The through hole 63D is located inside the parking gear 35 in the radial direction. The lubricating oil that has flowed out of the rotating shaft 60 through the through hole 63D is supplied to the spline, which is the fitting portion of the parking gear 35, and lubricates the spline. That is, the through hole 63D at the position D mainly constitutes an oil passage for spline lubrication.

The pipe unit 40 is inserted into the through hole 62 along the axis CL1. FIG. 3 is a perspective view of a part of the pipe unit 40. As shown in FIG. 3, the pipe unit 40 includes an annular pipe 41 having a diameter smaller than that of the through hole 62 extending in the left-right direction along the axis CL1 and a pair of left and right plates attached to the outer peripheral surface of the pipe 41. (Left plate 42, right plate 43). As shown in FIG. 2, the pair of left and right plates 42, 43 are provided at four axial directions (positions A to D) corresponding to the lubricating oil supply points. An inflow port 41a into which the lubricating oil flows is opened at the right end of the pipe 41, and an outflow port 41b through which the lubricating oil flows is opened at the left end.

As shown in FIGS. It has a cylindrical annular portion 42b, 43b and a substantially cylindrical annular portion 42c, 43c extending axially from the outer peripheral surface of the flat plate portions 42a, 43a. The inner peripheral surfaces of the annular portions 42b and 43b are joined to the outer peripheral surface of the pipe 41 by brazing or welding, whereby the pipe unit 40 is formed.

As shown in FIG. 2, the left and right ends of the pipe 41 are fitted into the pipe support holes 55 and 56 provided on the left and right side walls of the case 5, respectively, by press-fitting or light-fitting. The pipe support holes 55 and 56 are formed in a stepped shape in the axial direction, and the axial positions of the pipe 41 are regulated by the axial end surfaces of the pipe 41 abutting on the stepped portions 55a and 56a. The diameter of the outer peripheral surfaces of the annular portions 42c and 43c of the plates 42 and 43 of the pipe unit 40 is slightly smaller (for example, about 1 to 2 mm) than the diameter of the inner peripheral surface of the through hole 62 of the rotating shaft 60. As a result, the rotating shaft 60 can rotate without coming into contact with the pipe unit 40 while the pipe unit 40 is fixed to the case 5.

With the pipe unit 40 inserted in the through hole 62, in each of the positions A to D, a substantially annular shape surrounded by the pipe 41 and the rotating shaft 60 between the left plate 42 and the right plate 43. Oil spaces 45A to 45D are formed. Through holes 63A to 63D of the rotating shaft 60 face each of the oil spaces 45A to 45D, and the through holes 63A to 63D communicate with the oil spaces 45A to 45D, respectively.

As shown in FIGS. 2 and 3, a plurality of substantially circular through holes 44 in the circumferential direction are opened in the pipe 41 between the pair of left and right plates 42 and 43 facing the oil spaces 45A to 45D. As a result, the internal space 46 of the pipe 41 and the oil spaces 45A to 45D communicate with each other through the through hole 44.

The main operation of the lubricating oil supply device according to this embodiment will be described. Lubricating oil flows through the first oil passage PA1, the second oil passage PA2 (pipe 41), and the third oil passage PA3 by driving the oil pump 6. At this time, a part of the lubricating oil passing through the pipe 41 through the inflow port 41a and the outflow port 41b passes through the through hole 44 of the pipe 41 as shown by the arrow in FIG. It is guided within 45A to 45D. The lubricating oil of the oil space 45A~45D, respectively through the through-hole 63 A to 63 D is supplied to the rotor 11 and bearings 32, and the like.

By the way, the opening area of each of the through holes 63A to 63D of the rotating shaft 60 is smaller than the area of the outer peripheral surface of each of the oil spaces 45A to 45D. Therefore, in the flow of the lubricating oil from the oil spaces 45A to 45D to the outside of the rotary shaft 60, the through holes 63A to 63D function as a throttle, and the oil spaces 45A to 45D are filled with the lubricating oil. As a result, even when the vehicle is tilted or when acceleration in the front-rear direction or the left-right direction acts on the vehicle, it is possible to prevent the lubricating oil from being biased in the oil spaces 45A to 45D, and it is possible to prevent the lubricating oil from being biased around the rotating shaft 60. A necessary and sufficient amount of lubricating oil can be supplied to each part.

The sum of the volume of the internal space 46 in the pipe 41 and the volumes of the oil spaces 45A to 45D is smaller than the total volume of the through hole 62 of the rotating shaft 60. Therefore, the amount of lubricating oil required when the pipe unit 40 is provided in the through hole 62 can be reduced to be smaller than the amount of lubricating oil required when the pipe unit 40 is not provided. As a result, the pump capacity can be reduced and the oil pump 6 can be miniaturized.

According to this embodiment, the following effects can be obtained.
(1) The lubricating oil supply device communicates the lubricating oil supplied from the oil pump 6 through the through hole 62 formed in the rotary shaft 60 in the axial direction and the through hole 62 in the radial direction of the rotary shaft 60. It is configured to supply to each part (rotor 11, bearing 32, etc.) around the rotating shaft 60 via the through hole 63 through which the rotating shaft 60 is formed (FIG. 1). This lubricating oil supply device is accommodated in the through hole 62 along the axial direction, and the lubricating oil supplied from the oil pump 6 is guided to the pipe 41 and the pipe 41 in which the through hole 44 is bored in the radial direction. Left and right forming an annular oil space 45A to 45D extending radially from the outer peripheral surface of the rotary shaft 60 to the inner peripheral surface of the rotary shaft 60 and communicating with the through holes 63A to 63D of the rotary shaft 60 and the through holes 44 of the pipe 41. It includes a pair of plates 42, 43 (FIGS. 1 to 3).

With this configuration, the volume of the oil spaces 45A to 45D to be filled with the lubricating oil inside the rotary shaft 60 can be reduced to be smaller than the volume in the rotary shaft 60 formed by the through hole 62. Therefore, the pump capacity can be reduced and the oil pump 6 can be miniaturized. That is, in order to supply sufficient lubricating oil to each part around the rotating shaft 60 when the vehicle is tilted or acceleration acts on the vehicle, the space on the upstream side of the through holes 63A to 63D of the rotating shaft 60 is filled with the lubricating oil. Must be met. In this respect, in the present embodiment, the upstream space (oil space 45A to 45D) of the through holes 63A to 63D is configured to be narrower than the volume of the through hole 62 by the pipe 41 and the pair of left and right plates 42 and 43. The required amount of lubricating oil can be suppressed, the oil pump 6 can be miniaturized, and an increase in cost can be prevented. Further, by suppressing the required amount of lubricating oil, it is possible to shorten the arrival time of the lubricating oil to the portion requiring lubrication and cooling, and it is possible to improve wear resistance and cooling performance. Furthermore, friction can be reduced by promptly supplying lubricating oil, which contributes to improved fuel efficiency.

(2) The rotating shaft 60 is provided with a through hole 62 penetrating in the axial direction, the pipe 41 penetrates the through hole 62, and both ends thereof in the axial direction are arranged on both sides in the axial direction of the rotating shaft 60. It is supported by the pipe support holes 55 and 56 of the case 5 (FIG. 2). As a result, the pipe 41 and the pair of left and right plates 42, 43 integrated with the pipe 41 can be easily arranged inside the rotating shaft 60.

(3) The rotating shaft 60 constitutes a part of the vehicle driving device 100 and is extended in a substantially horizontal direction (left-right direction) (FIG. 1). Under such a configuration, the lubricating oil may be biased in the rotating shaft 60, and the oil pump 6 tends to be large in size in order to avoid it. However, in the present embodiment, the pipe unit is contained in the rotating shaft 60. Since the 40 is accommodated, it is possible to suppress the bias of the lubricating oil in the rotating shaft 60 without increasing the size of the oil pump 6.

(4) The through holes 63A to 63D of the rotating shaft 60 and the through holes 44 of the pipe 41 are bored at a plurality of positions (positions A to D) in the axial direction, respectively, and the pair of left and right plates 42 and 43 are provided in the axial direction. It is provided at a plurality of positions in the axial direction corresponding to the plurality of through holes 63A to 63D, 44 (FIG. 2). As a result, a part of the lubricating oil flowing through the pipe 41 can be simultaneously supplied to a plurality of axial parts (rotor 11, bearing 32, etc.) around the rotating shaft 60.

In the above embodiment, the through hole 62 (first hole) is bored in the axial direction with respect to the rotary shaft 60, but the first hole is penetrated through the rotary shaft 60 by, for example, closing one end in the axial direction. It may be provided without letting it. In this case, one end side of the pipe unit in the axial direction may be cantilevered and supported by the case. In the above embodiment, a single axial through hole 63A to 63D (second hole) is formed in the rotating shaft 60 facing the respective oil spaces 45A to 45D, but at least one of the oil spaces 45A to 45D is formed. A plurality of axial through holes may be provided as second holes facing the surface.

In the above embodiment, the pipe unit 40 is configured by fixing a pair of left and right plates 42, 43 to the outer peripheral surface of the pipe 41, but the configuration of the pipe unit is not limited to this. That is, if the lubricating oil accommodated in the first hole along the axial direction and supplied from the oil pump is guided, the configuration of the pipe member is not limited to the above-mentioned one, and the first from the outer peripheral surface of the pipe member. The configuration of the plate member is not limited to that described above as long as it extends radially toward the peripheral surface of the hole and forms an annular space communicating with the second hole and the through hole.

In the above embodiment, the pipe unit 40 is accommodated in the axial through hole 62 of the rotating shaft 60 of the traveling motor 1, but the pipe unit may be accommodated inside another rotating shaft. In this case, the axial arrangement of the pipe and the through hole penetrating the rotating shaft in the radial direction is appropriately determined by the arrangement of the parts around the rotating shaft. In the above embodiment, the lubricating oil supply device is applied to the vehicle drive device 100, but the present invention can be similarly applied to other than the vehicle drive device.

The above description is merely an example, and the present invention is not limited to the above-described embodiments and modifications as long as the features of the present invention are not impaired. It is also possible to arbitrarily combine one or a plurality of the above-described embodiments and the modified examples, and it is also possible to combine the modified examples.

5 Cases, 6 Oil Pumps, 40 Pipe Units, 41 Pipes, 42, 43 Plates, 44 Through Holes, 45A-45D Oil Spaces, 60 Rotating Shafts, 62 Through Holes, 63A-63D Through Holes, 100 Vehicle Drives

Claims (3)

Lubricating oil supplied from the oil pump is passed through a first hole in the axial direction formed in the rotary shaft and a second hole that communicates with the first hole and penetrates the rotary shaft in the radial direction. A lubricating oil supply device that supplies each part around the rotating shaft.
A pipe member accommodated in the first hole along the axial direction, to which the lubricating oil supplied from the oil pump is guided, and a through hole is formed in the radial direction.
A pair of axial plate members extending in the radial direction from the outer peripheral surface of the pipe member to the peripheral surface of the first hole and forming an annular space communicating with the second hole and the through hole are provided .
The second hole and the through hole are bored at a plurality of axial directions, respectively, and the pair of plate members are provided at a plurality of axial directions corresponding to the plurality of the second holes and the through holes in the axial direction. A lubricating oil supply device characterized by being provided. In the lubricating oil supply device according to claim 1,
The first hole is provided so as to penetrate the rotation axis in the axial direction.
A lubricating oil supply device, wherein the pipe member penetrates the first hole, and both ends thereof in the axial direction are supported by cases arranged on both sides in the axial direction of the rotating shaft. In the lubricating oil supply device according to claim 1 or 2.
The rotary shaft constitutes a part of a vehicle drive device and is a lubricating oil supply device characterized by being extended in a substantially horizontal direction.

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